decking



(No Model.)

" J. V. BOYD-WILSON.

BRIDGE FLOORING, DEOKINGr, ROOFING, 8w.

. No. 542,325. Patented July 9, 1895.

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Unirrnn STATES PATENT OFFICE.

JOHN VICTOR BOYD-IVILSON, OF GLASGOW, SCOTLAND.

BRIDGE FLOORING','DECKING, ROOFING, 800.

SPECIFICATION forming part of Letters Patent No. 542,325, dated July 9,1895. Application filed March 2, 1895. Serial No. 540,321. (No model.)Patented in England February 16, 1891, No. 2,791.

all whom it may concern.-

Be it known that I, JOHN VICTOR BOYD? WILSON, a subject of Victoria,Queen of Great Britain and Ireland, and a resident of Germiston Works,Glasgow, Scotland, have invented certain new and useful Improvements inBridge Flooring, Decking, Roofing, Fire-Resisting Constructions, and theLike, and for Material in Use Therein, (for which I to have obtainedapatent in Great Britain, No. 2,791, bearing date of February 16, 1891,)of which the following is a specification.

The object of my invention is to provide more ready and eifective meansfor forming I 5 fire-resisting constructions, such as fioorings ofbuildings, deckings of piers and the like, bridge flooring, and forother purposes of a similar nature or for roofing.

In carrying out my said invention I propose to employ channel beams orgirders of a poculiar section, so that the webs may abut close to eachother if desired, and in combination with these a concrete speciallyprepared in blocks of peculiar shape and section, as shown, onaccompanying sheet of drawings referring to w-hich Figurel is a sectionshowing one method of construction with concrete blocks of double T-sectiorQ Fig. 2 is a section showing a heavier o flooring orconstruction, the concrete blocks .being of different section; and Fig.3 is asection of channel-beam or girder rolled out fiat before beingbent or drawn to shape shown 1) dotted lines.

channel iron and as shown in Fig. 3, and then lines or by A A B B, Figs.1 and 2, the metal I 40 being in some cases fiat on the crown or it maybe thickened out,'as A, or have a bulb on the under side, as B. Thelower extremities of the Webs are vertical, as at O O, and terminate ininternal flanges D D. These 5 channel or arched beams or girders aresupported on suitable bearings across the space to be floored orcovered, either close together, as in Fig. 1, or at distances apart, asin Fig. 2, and from or upon the flanges D D, I suspend or form concreteblocks of double T-section, such as E E. Over and between the metalbeams I fill up to the requisite height with concrete prefer to usebeams or girders rolled as F, the whole of which filling as well as theconcrete blocking is composed as hereinafter described. The lowerL-fianges of the blocks are longer than the upper T, so as to meet, ornearly so, under the metal, as at E, Fig. 1, and the whole of the underside of the construction is floated with finer concrete or mixture. WhenI find it desirable to place the beams at distances apart, as in Fig. 2,the suspended concrete blocks are of difierent sections, such as HHsupporting at H H flat slabs, such as J J, the concrete being filled inbetween, around, and over the girders as I compose my special concretefor use in these constructions of a material known as kieselgu hr ordiatomitef either alone or in combination with Portland or other cementand with suitable aggregate, and I find in practice that the followingproportions are the most suitable. The parts or proportions are bymeasurement, not weight.

No 1. Four parts broken hard burned bricks, burned ballast, slag, or thelike; one and one-half parts clean cinders or clinkers; one and one-halfparts Portland or other comout; one part diatomite or kieselguhr.

No. 2. Five parts broken hard burned bricks, burned ballast, burnedshale, slag or the like; two parts clean cinders or clinkers; two partsPortland or other cement; one part diatomite or kieselguhr.

No. 3. Five parts broken hard burned bricks, burned ballast, burnedshale, or the like; one'and one-half parts clean cinders or clinkers;one and one-fourth parts Portland or other cement; three-fourths partdiatomite or kieselguhr.

No. 4. Three and one-half parts broken hard burned bricks, burnedballast, burned shale or the like; three and one-half-parts cleancinders or clinkers; two parts Portland or other cement; one partdiatomite or kieselguhr.

This form of construction may also be applied to Mansard and pitchedroofing, partitions, and the like. 7 Having now particularly describedand ascertained the nature of my said invention and in what manner thesame is to be performed, I declare that what I claim is-' In combinationthe girders of inverted U shape having integral inwardly turned Inwitness whereof I have hereunto set my flanges, and the concrete blocksbetween the hand in presence of two witnesses. sides of said girder,said blocks having 7 T grooves in their upper portions to receive theJOHN VICIOR B01 D'WILbON' 5 inwardly turned flanges, the base portionsof \Vitnesses:

said blocks extending under the said flanges, WILLIAM SHAW,substantially as described. HUGH MCDOUGALL.

